First off, I get that we don't know much about sentinel. I'd like to think of it as a mobile bubble that can attack. If it can attack, it's not all focused on defending, which makes it weaker. Here are my concerns. Nova Bomb can already pop a bubble. Striker can already pop a bubble. GG can already pop a bobble. I'm concerned about GG and striker mainly. 3 shots to pop a bubble. GG can fan-fire 6 shots in D2. Does GG one-shot kill a guarding Sentinel Titan? Does Striker have to use both slams to kill a guarding Sentinel Titan? Can Striker shoulder-charge a guarding Sentinel Titan? Can Sentinel reflect projectiles and Energy? Can the speed of Sentinel's shield throw compete with a Golden Gun or a Dawnblade or a Hammer of Sol? How long does it take to come back to you? Does it one-shot? TL;DR I'm concerned about the Sentinel's defensive capabilities in comparison to the current bubble and the new upgraded striker and golden gun.